Fix the testall npm script (#32081)
Fix the testall npm script (#32081)



`yarn test` has been removed by #32042, so it should be replaced by the other test scripts.
azukaru/next.js,zeit/next.js,azukaru/next.js,azukaru/next.js,JeromeFitz/next.js,zeit/next.js,JeromeFitz/next.js,zeit/next.js,JeromeFitz/next.js,azukaru/next.js,JeromeFitz/next.js